Diffusion transfer photographic materials comprising polyvinyl ether neutralizing layer

Abstract

An improved neutralization layer is disclosed for a diffusion transfer photographic material wherein said layer contains a copolymer having a monomer unit represented by the formula ##STR1## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR2## in which R is hydrogen or an alkyl group.

What is claimed is: 
     
       1. In a diffusion transfer photographic material having a support and thereon a neutralization layer for lowering a pH value increased by application of an alkaline processing composition, the improvement which comprises the neutralization layer comprising a copolymer containing, as a monomer unit, a monomer of the general formula: ##STR86## wherein A is a divalent radical selected from the group consisting of an alkylene group, an arylene group and a combination group consisting of at least one alkylene group and at least one arylene group; the alkylene group containing two or more carbon atoms; the alkylene group, the arylene group and the combination group containing at least one --COOR and/or at least one ##STR87## in which R is hydrogen or an alkyl group. 
     
     
       2. A diffusion transfer photographic material as claimed in claim 1 wherein the alkyl group for R is unsubstituted alkyl. 
     
     
       3. A diffusion transfer photographic material as claimed in claim 1 wherein the alkylene group, the arylene group or the combination group for A contains one -COOR. 
     
     
       4. A diffusion transfer photographic material as claimed in claim 1 wherein the alkylene group for A is an alkylene group having 2 to 8 carbon atoms. 
     
     
       5. A diffusion transfer photographic material as claimed in claim 1 wherein the alkyl group for R is of 1 to 8 carbon atoms. 
     
     
       6. A diffusion transfer photographic material as claimed in claim 1 wherein the at least one alkylene group for the combination group is of 1 to 4 carbon atoms. 
     
     
       7. A diffusion transfer photographic material as claimed in claim 1 wherein the copolymer contains the monomer in an amount of 10% or more in the molar proportion. 
     
     
       8. A diffusion transfer photographic material as claimed in claim 1 wherein the amount of the copolymer in the photographic material is 0.1 - 0.3 g per 100 cm 2  of the photographic material 
     
     
       9. A diffusion transfer photographic material as claimed in claim 1 wherein the photographic material comprises a transparent support, a receiving layer, a light-sensitive silver halide emulsion layer and a transparent cover sheet in this order, the photographic material comprising the neutralization layer between the emulsion layer and the cover sheet. 
     
     
       10. A diffusion transfer photographic material as claimed in claim 9 wherein the photographic material further comprises a timing layer between the neutralization layer and the emulsion layer. 
     
     
       11. A diffusion transfer photographic material as claimed in claim 1 wherein the photographic material comprises, in turn, a transparent support, a receiving layer, a light-sensitive silver halide emulsion layer and a transparent cover sheet, the photographic material comprising the neutralization layer between the support and the receiving layer. 
     
     
       12. A diffusion transfer photographic material as claimed in claim 11 wherein the photographic material further comprises a timing layer between the neutralization layer and the receiving layer.